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2 years ago

Please answer my question, this is the third time i've asked. (75 Points)

Mathematics

2 answers:

Grace [21]2 years ago

7 0

Answer: A. .20x640=128

128+640=768

B. .15x640=96

640-96

Step-by-step explanation:

natta225 [31]2 years ago

3 0

For A it is 6240 / 20% for B it is 6240 x 15%

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Simplify the expression. 8x^-10 y^'6 -2x^2y^-8 Write your answer without negative exponents.

sergij07 [2.7K]

Answer:

$8x^{-10}y^6 - 2x^2y^{-8} = \frac{8y^{14} - 2x^{12}}{x^{10}y^8}$

Step-by-step explanation:

Given

$8x^{-10}y^6 - 2x^2y^{-8}$

Required

Simplify

Rewrite as:

$8x^{-10}y^6 - 2x^2y^{-8} = \frac{8y^6}{x^{10}} - \frac{2x^2}{y^8}$

Take LCM

$8x^{-10}y^6 - 2x^2y^{-8} = \frac{8y^6*y^8 - 2x^2 * x^{10}}{x^{10}y^8}$

Apply law of indices

$8x^{-10}y^6 - 2x^2y^{-8} = \frac{8y^{14} - 2x^{12}}{x^{10}y^8}$

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3 years ago

6. What percentage of the children in class 5 is a member of a sports club? 3

Juliette [100K]

Answer:

75%

Step-by-step explanation:

Let x be the percentage for sports club members.

x% of 20 = 15

x/100 x 20 = 15

x/5 = 15

x = 75

5 0

3 years ago

a contractor charges $1200 for 100 square feet of roofing installed. at this rate, how much does it cost to have 1100 square fee

Ratling [72]

Step-by-step explanation:

If it cost $1200 to install 100 square feet of roofing, then it will cost $13200 to have 1100 square feet installed.

$1200/ 100 square feet multiply 11 on both sides

$13200/ 1100 square feet

<h3><u><em>Please mark this as brinliest thank you!!!</em></u></h3><h3><u><em>: )</em></u></h3><h3><u><em>And as always, </em></u></h3><h3><u><em>simplify bananas</em></u></h3>

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3 years ago

a gear ratio is the ratio of the teeth on the front sprocket and the teeth on the rear sprocket.if a bike has 36 teeth on the fr

Ber [7]

Answer:

3 : 1

Step-by-step explanation:

ratio = teeth on front sprocket : teeth on rear sprocket

= 36 : 12 ( divide both parts of the ratio by 12 )

= 3 : 1 ← in simplest form

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3 years ago

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hoa [83]

Answer:

49.73

Step-by-step explanation:

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4 years ago

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